820-00165 green light, fan spin but no boot

[Sr. Robot]

Hi, got an 820-00165 with no signs of damage.

PPBUS_G3H: 8.57v
PP3V42_G3H: 3.4v
PP5V_S5: 5.14v
PP5V_S0: 5.13v
PP3V3_S5: 3.3v
PP3V3_S4: 3.3v
PP3V3_SUS: 3.3v
PP3V3_S3: 3.3v
PP3V3_S0: 3.3v
PP1V8_S3: 1.78v
PP1V2_S3: 1.2v
PP1V05_SUS: 1.059
PP1V5_S0: 1.5v
PP1V05_S0: 1.051
PPVCC_S0_CPU: 1.7v (CPU not getting warm)

 

[2informaticos]

PLT_RESET_L comes high?
Tested USB activity?
Tried BIOS?

 

[Sr. Robot]

PLT_RESET_L is 0v
There is USB activity
Swapped for known working BIOS no change.

 

[2informaticos]

"PLT_RESET_L is 0v
There is USB activity"
Impossible...

Pin 3/U1950 goes high?

 

[Sr. Robot]

Pin 3/U1950 goes 3.4v

Sorry, i get 5v but no activity on USB

 

[2informaticos]

Check CPU_VCCST_PWRGD and CPU_VR_READY.
Also check all voltages from page 11.

 

[Sr. Robot]

CPU_VCCST_PWRGD: 1.014v
CPU_VR_READY: 1.05v

Page 11:

PP3V3_S5: 3.3v
PP3V3_SUS: 3.3v
P3V3_S0: 3.3v
PP1V5_S0SW_AUDIO_HDA: 1.5v
PP1V05_S0: 1.5
PP1V05_S0SW_PCH_HSIO: 1.05v
PP1V05_S0_PCH_VCCACLKPLL_R: 1.05v
PP1V05_S0_PCH_VCCACLKPLL: 1.05v
PP1V05_S0_PCH_VCC_ICC_R: 1.05v
PP1V05_S0_PCH_VCC_ICC: 1.05v
PP1V05_S0_PCH_VCCAPLL_OPI: 1.05v
PP1V05_S0SW_PCH_HSIO: 1.05v
PP1V05_S0SW_PCH_VCCSATA3PLL: 1.05v
PP1V05_S0SW_PCH_VCCUSB3PLL: 1.05v

 

[2informaticos]

Looks like PCH issue.
Try heating its area with quality flux.

 

[Sr. Robot]

Heated with plenty of flux by the sides and from the bottom. No change